Investigation of Mechanical Processing of Solar Photovoltaic Panels
Šperlich, Antonín
2024 - English This work aims to describe the possibilities of mechanical treatment of solar photovoltaic panels. In the first part, the shredding and milling process for the transformation of the product (whole panel) into material that can be further processed, was investigated. Milled material was sieved and analyzed. It was observed that this shredding also works as a selective grinding because three main products were produced. The second part of this work was aimed at the physical concentration of silver in real samples of milled solar photovoltaic panels by Knelson separator. This device (type of centrifugal separator) showed the ability to significantly increase the amount of silver in the outcome stream. Keywords: solar photovoltaic panels; selective milling; Knelson Available in a digital repository NRGL Investigation of Mechanical Processing of Solar Photovoltaic Panels

This work aims to describe the possibilities of mechanical treatment of solar photovoltaic panels. In the first part, the shredding and milling process for the transformation of the product (whole ...

Šperlich, Antonín
Ústav chemických procesů, 2024

Axial Dispersion and Mass Transfer in Bubble Column
Terentyak, Mark
2024 - English The objective of the study is to experimentally investigate axial dispersion and mass transfer within a bubble column, examining their mutual interrelation\nand their correlation with operational parameters and AR1. Keywords: bubble column; axial dispersion; mass transfer Available in a digital repository NRGL Axial Dispersion and Mass Transfer in Bubble Column

The objective of the study is to experimentally investigate axial dispersion and mass transfer within a bubble column, examining their mutual interrelation\nand their correlation with operational ...

Terentyak, Mark
Ústav chemických procesů, 2024

Exploring Bubble Dynamics with VOF Method Simulations: Insights from Two Fundamental Gas-Liquid Flow Case Studies
Harrandt, Václav
2024 - English The present study focuses on the flow of Taylor bubbles, representing the interaction between the channel wall and the gas phase, and the collision of\na bubble with a vortex ring, serving as a model liquid-gas interaction. Understanding the former case can be essential to prevent the membrane\nfouling or the flow induced corrosion. The dynamics of the latter case is the predictive criterion for whether the initial mother bubble will break up into the daughter bubbles or not2 and this process can therefore be used as an idealized model of turbulent bubble flow. Keywords: bubble dynamics; multiphase interaction,; numerical simulation Available in a digital repository NRGL Exploring Bubble Dynamics with VOF Method Simulations: Insights from Two Fundamental Gas-Liquid Flow Case Studies

The present study focuses on the flow of Taylor bubbles, representing the interaction between the channel wall and the gas phase, and the collision of\na bubble with a vortex ring, serving as a model ...

Harrandt, Václav
Ústav chemických procesů, 2024

Kultura České republiky v číslech 2023:
Dedera, Milan; NIPOS, Národní informační a poradenské středisko pro kulturu
2024 - Czech Statistika kultury se zabývá zjišťováním údajů o činnosti kulturních subjektů (např. návštěvnost, kapacita, vzdělávací akce, vydané publikace, výpůjčky, čtenáři). V předkládané brožuře jsou zveřejněny vybrané údaje za následující obory: divadlo, galerie, muzea a památníky, hvězdárny, planetária a astronomické pozorovatelny, veřejné knihovny, památkové objekty zpřístupněné za vstupné, neperiodické publikace a periodický tisk. Údaje ekonomické povahy jsou k dispozici pouze za subjekty veřejného sektoru, kulturní subjekty v soukromém sektoru je neposkytují. Keywords: divadelní představení; galerie; hudební tělesa; knihovny; kultura a společnost; muzea; nakladatelství; návštěvnost; památkové objekty; statistika; umění a společnost; výstavnictví; ancient monuments; art and society; culture and society; ensembles; galleries; libraries; museums; numbers of visitors; organization of exhibitions; publishing houses; statistics; theatrical perfomances Available in a digital repository NRGL Kultura České republiky v číslech 2023:

Statistika kultury se zabývá zjišťováním údajů o činnosti kulturních subjektů (např. návštěvnost, kapacita, vzdělávací akce, vydané publikace, výpůjčky, čtenáři). V předkládané brožuře jsou zveřejněny ...

Dedera, Milan; NIPOS, Národní informační a poradenské středisko pro kulturu
NIPOS, 2024

Gas sensors based on diamond heterostructures for air quality monitoring
Kočí, Michal; Szabó, Ondrej; Izsák, T.; Sojková, M.; Godzierz, M.; Wróbel, P.; Husák, M.; Kromka, Alexander
2024 - English Currently, great emphasis is placed on air quality and the presence of pollutants. Attention is therefore focused on new gas-sensing materials enabling detection even at low (up to room) temperatures with sufficient response and short reaction time. Here, we investigate the suitability of H-NCD films and their heterostructures with MoS2, GO, rGO, SH-GO, or Au NPs for gas sensing applications. Electrical properties are measured for oxidizing gas NO2, reducing gas NH3, and chemical vapor of ethanol, and at temperatures varied from room temperature to 125 °C. In contrast to the individual forms of employed materials with limited response to the exposed gases, the HNCD heterostructures revealed better sensing properties. In particular, the Au NPs/H-NCD heterostructures revealed a higher response at 125 °C in contrast to H-NCD, MoS2/H-NCD had quite good response even at room temperature and GO/H-NCD revealed high sensitivity to chemical vapor, which further improved for the SH-GO/HNCD. Keywords: gas sensors; nanocrystalline diamond; heterostructures; air quality monitoring Fulltext is available at external website. Gas sensors based on diamond heterostructures for air quality monitoring

Currently, great emphasis is placed on air quality and the presence of pollutants. Attention is therefore focused on new gas-sensing materials enabling detection even at low (up to room) temperatures ...

Kočí, Michal; Szabó, Ondrej; Izsák, T.; Sojková, M.; Godzierz, M.; Wróbel, P.; Husák, M.; Kromka, Alexander
Fyzikální ústav, 2024

The Influence of Geometric Parameters of 3D Printed Structured Beds on Hydrodynamic Characteristics of Trickle-Bed Reactor
Nyklíčková, Kateřina
2024 - English The study examines a parametric set of POCS structures, where cubic cell is the basic element. The parameters such as strut diameter sd and cell size cs were varied1. These modifications are implemented with an emphasis on maintaining similar porosity and specific surface area for these structures. Keywords: trickle-bed reactor; pressure dop; POCS structures Available in digital repository of the ASCR The Influence of Geometric Parameters of 3D Printed Structured Beds on Hydrodynamic Characteristics of Trickle-Bed Reactor

The study examines a parametric set of POCS structures, where cubic cell is the basic element. The parameters such as strut diameter sd and cell size cs were varied1. These modifications are ...

Nyklíčková, Kateřina
Ústav chemických procesů, 2024

Surface changes induced by plasma treatment and high temperature annealing of silicon dioxide microparticles
Babčenko, Oleg; Remeš, Zdeněk; Beranová, Klára; Kolářová, Kateřina; Lörinc, J.; Prošek, Z.; Tesárek, P.
2024 - English Due to the high surface to volume ratio, the particles’ surface properties modification defines its properties in general, which is crucial for their use. From this point of view, plasma processing or high temperature annealing can be considered as the universal techniques for efficient modification of materials in the form of powder. In this study, the silicon dioxide microparticles have been treated in a hydrogen, oxygen or vacuum by low temperature plasma or annealing. The change of SiO2 microparticles properties was investigated by photoluminescence spectroscopy at room and low temperature. High temperature annealing in hydrogen induced under UV excitation photoluminescence in the near UV and visible light indicating the change of defect states on the surface of the microparticles. We believe that observed findings clearly demonstrate useful method for analysis of SiO2 microparticles surface modification attractive also for fundamental research. Keywords: silicon dioxide; plasma treatment; annealing; photoluminescence; measuring setup Fulltext is available at external website. Surface changes induced by plasma treatment and high temperature annealing of silicon dioxide microparticles

Due to the high surface to volume ratio, the particles’ surface properties modification defines its properties in general, which is crucial for their use. From this point of view, plasma processing or ...

Babčenko, Oleg; Remeš, Zdeněk; Beranová, Klára; Kolářová, Kateřina; Lörinc, J.; Prošek, Z.; Tesárek, P.
Fyzikální ústav, 2024

Finite element approximation of fluid structure interaction using Taylor-Hood and Scott-Vogelius elements
Vacek, Karel; Sváček, P.
2024 - English This paper addresses the problem of fluid flow interacting a vibrating solid cylinder described by one degree of freedom system and with fixed airfoil. The problem is described by the incompressible Navier-Stokes equations written in the arbitrary Eulerian-Lagrangian (ALE) formulation. The ALE mapping is constructed with the use of a pseudo-elastic approach. The flow problem is numerically approximated by the finite element method (FEM). For discretization of the fluid flow, the results obtained by both the Taylor-Hood (TH) element and the Scott-Vogelius (SV) finite element are compared. The TH element satisfies the Babuška-Brezzi inf-sup condition, which guarantees the stability of the scheme. In the case of the SV element the mesh, that is created as a barycentric refinement of regular triangulation, is used to satisfy the Babuška-Brezzi condition. The numerical results for two benchmark problems are shown. Keywords: finite element method; arbitrary Lagrangian-Eulerian method; Scott-Vogelius element; Taylor-Hood element Available in digital repository of the ASCR Finite element approximation of fluid structure interaction using Taylor-Hood and Scott-Vogelius elements

This paper addresses the problem of fluid flow interacting a vibrating solid cylinder described by one degree of freedom system and with fixed airfoil. The problem is described by the incompressible ...

Vacek, Karel; Sváček, P.
Matematický ústav, 2024

Podnikání jako mužský svět? Využívání kompetencí v podnikání sebezaměstnaných žen a mikropodnikatelek v ČR
Maříková, Hana; Švarcová, Markéta; Křížková, Alena
2024 - Czech Fulltext is available at external website. Podnikání jako mužský svět? Využívání kompetencí v podnikání sebezaměstnaných žen a mikropodnikatelek v ČR

Maříková, Hana; Švarcová, Markéta; Křížková, Alena
Sociologický ústav, 2024

The American origin of the French Revolution
Ottinger, Sebastian; Rosenberger, L.
2024 - English We show that the French combatants’ exposure to the United States increased support for the French Revolution a decade later. French regions from which more American combatants originated had more revolts against feudal institutions, revolutionary societies, volunteers for the revolutionary army, and emigrants from the Old Regime’s elite. To establish causality, we exploit two historical coincidences: i) originally, a French army of seven and a half thousand was ready to sail, but one-third did not, ii) among those deployed, only some regiments were stationed in New England. Only combatants exposed to New England affected the French Revolution after their return. Keywords: institutional change; French Revolution; American War of Independence Fulltext is available at external website. The American origin of the French Revolution

We show that the French combatants’ exposure to the United States increased support for the French Revolution a decade later. French regions from which more American combatants originated had more ...

Ottinger, Sebastian; Rosenberger, L.
Národohospodářský ústav, 2024